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What has a closed circulatory system?

Author:
February 20th, 2023

All vertebrates and a few invertebrates.
This is a short and sweet. All vertebrates have a closed respiratory system and some invertebrates do as well.
The invertebrates I can think of that have a closed respiratory system are cephalopods like an octopus or Annelids like earthworms…. just incase you were curious.

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